<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerPic" />
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <text
        @click="activeIndex = index"
        v-for="(item, index) in subTypes"
        :key="item.id"
        class="text"
        :class="{ active: index === activeIndex }"
      >
        {{ item.title }}
      </text>
    </view>
    <!-- 列表内容 -->

    <!-- 2. 监听滚动到底部的事件 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      v-for="(item, index) in subTypes"
      v-show="activeIndex === index"
      :key="item.id"
      @scrolltolower="loadMore"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading">正在加载...</view>
    </scroll-view>
  </view>
</template>
<script setup>
// 需求：实现无限滚动 💥 找到正在滚动盒子自己的page

import { onLoad } from "@dcloudio/uni-app";
import { getRecommendAPI } from "@/api/home";
import { ref } from "vue";

const urlMap = {
  1: { title: "特惠推荐", url: "/hot/preference" },
  2: { title: "爆款推荐", url: "/hot/inVogue" },
  3: { title: "一站买全", url: "/hot/oneStop" },
  4: { title: "新鲜好物", url: "/hot/new" },
};

const bannerPic = ref("");
const subTypes = ref([]);
const activeIndex = ref(0);

const loadData = async (url) => {
  const { result } = await getRecommendAPI(url);
  bannerPic.value = result.bannerPicture;
  subTypes.value = result.subTypes;
};

const loadMore = async () => {
  const oldItem = subTypes.value[activeIndex.value].goodsItems;
  const { page } = oldItem;
  const id = subTypes.value[activeIndex.value].id;

  const { result } = await getRecommendAPI(paramsURL.value, id, page + 1);
  const newItem = result.subTypes[activeIndex.value].goodsItems;
  bannerPic.value = result.bannerPicture;

  // 💥找到新旧数组，把新数组追加到旧数组中
  oldItem.items.push(...newItem.items);

  // 💥找新旧page，把新page覆盖旧page
  oldItem.page = newItem.page;
};

const paramsURL = ref("");
onLoad((xxx) => {
  const item = urlMap[xxx.type];
  uni.setNavigationBarTitle({ title: item.title });
  loadData(item.url);
  paramsURL.value = item.url;
});
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}

.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}

.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}

.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;

  .text {
    margin: 0 20rpx;
    position: relative;
  }

  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}

.scroll-view {
  flex: 1;
  overflow: hidden;
}

.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;

  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }

  .thumb {
    width: 305rpx;
    height: 305rpx;
  }

  .name {
    height: 88rpx;
    font-size: 26rpx;
  }

  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}

.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>
